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pseudoscholastic

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darcs-hash:20050306124728-2648a-e3eb0f8e6157cd343a9b7b7fe114b5894ceb5cf7.gz
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nik gaffney 2005-03-06 20:47:28 +08:00
parent c22a4e1389
commit 271545fbad
1 changed files with 27 additions and 26 deletions
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51
osc.lisp
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@ -17,7 +17,7 @@
;;
;; requirements
;;
;; dependent on sbcl for float encoding, other suggestions welcome.
;; dependent on sbcl or cmucl for float encoding, other suggestions welcome.
;;
;; commentary
;;
@ -57,6 +57,8 @@
;; - in-package'd
;; 2005-03-01
;; - fixed address string bug
;; 2005-0305
;; - 'declare' scattering and other optimisations
(defpackage :osc
(:use :cl)
@ -66,7 +68,7 @@
(in-package :osc)
(declaim (optimize (speed 2) (safety 1)))
(declaim (optimize (speed 3) (safety 1)))
;;;;;; ; ;; ; ; ; ; ; ; ;
;;
@ -112,7 +114,6 @@
(cat lump
(pad (padding-length (length lump)))))))
(defun encode-data (data)
"encodes data in a format suitable for an OSC message"
(let ((lump (make-array 0 :adjustable t :fill-pointer t)))
@ -127,7 +128,6 @@
lump)))
;;;;;; ; ;; ; ; ; ; ; ; ;
;;
;; decoding OSC messages
@ -164,23 +164,23 @@
(map 'vector
#'(lambda (x)
(cond
((eq x (char-code #\i))
(push (decode-int32 (subseq acc 0 4))
result)
(setf acc (subseq acc 4)))
((eq x (char-code #\f))
(push (decode-float32 (subseq acc 0 4))
result)
(setf acc (subseq acc 4)))
((eq x (char-code #\s))
(let ((pointer (+ (padding-length (position 0 acc))
(position 0 acc))))
(push (decode-string
(subseq acc 0 pointer))
result)
(setf acc (subseq acc pointer))))
((eq x (char-code #\b)) (decode-blob x))
(t (error "unrecognised typetag"))))
((eq x (char-code #\i))
(push (decode-int32 (subseq acc 0 4))
result)
(setf acc (subseq acc 4)))
((eq x (char-code #\f))
(push (decode-float32 (subseq acc 0 4))
result)
(setf acc (subseq acc 4)))
((eq x (char-code #\s))
(let ((pointer (+ (padding-length (position 0 acc))
(position 0 acc))))
(push (decode-string
(subseq acc 0 pointer))
result)
(setf acc (subseq acc pointer))))
((eq x (char-code #\b)) (decode-blob x))
(t (error "unrecognised typetag"))))
tags)
(nreverse result)))
@ -204,7 +204,7 @@
#-(or sbcl cmucl) (error "cant decode floats using this implementation"))
(defun decode-int32 (s)
(declare (type (simple-array integer) s))
(declare (type (simple-array integer) s))
"4 byte > 32 bit int > two's compliment (in network byte order)"
(let ((i (+ (ash (elt s 0) 24)
(ash (elt s 1) 16)
@ -212,7 +212,7 @@
(elt s 3))))
(if (>= i #x7fffffff)
(- 0 (- #x100000000 i))
i)))
i)))
(defun encode-int32 (i)
"convert integer into a sequence of 4 bytes in network byte order."
@ -220,8 +220,8 @@
(let ((buf (make-sequence
'(vector (unsigned-byte 8)) 4)))
(macrolet ((set-byte (n)
`(setf (elt buf ,n)
(logand #xff (ash i ,(* 8 (- n 3)))))))
`(setf (elt buf ,n)
(logand #xff (ash i ,(* 8 (- n 3)))))))
(set-byte 0)
(set-byte 1)
(set-byte 2)
@ -255,6 +255,7 @@
"determines the length required for a padded osc string"
(declare (type simple-string string))
(let ((n (length string)))
(declare (type fixnum n))
(+ n (padding-length n))))
(defun padding-length (s)